👉 The FD I/O (File Descriptor I/O) is a feature in Linux and other Unix-like operating systems that allows multiple file descriptors to share the same underlying file system resources, such as disk blocks or network sockets, efficiently. Each file descriptor corresponds to a specific I/O operation, like reading from or writing to a file. By using FD I/O, processes can communicate with each other through these shared descriptors, enabling complex data structures and inter-process communication without the need for explicit pipe creation or shared memory. This mechanism is particularly useful for building robust file systems and network applications that require coordinated access to resources.
